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In this work we present an experimental study of structure and phasestability in ternary Cu-Sn-In alloys around 55 at.% Cu in the temperature range100^{\circ}C < T < 550^{\circ}C. We have followed in real-time the sequence ofphase transformations in succesive heating and cooling ramps, usingstate-of-the-art neutron powder thermodiffractometry. These experiments werecomplemented with calorimetric studies of the same alloys. Our results giveexperimental support to the current assessment of the ternary phase diagram inthis composition and temperature range, yielding the sequence of transitions\eta -> \eta + L -> \epsilon + L with transformation temperatures of210^{\circ}C and 445^{\circ}C, respectively. The use of neutrons allowed toovercome common difficulties in phase identification with powder XRD due toabsorption and preferred orientation issues. Even the transitions to liquidphases could be successfully identified and monitored in situ, turning thistechnique into a valuable tool for phase diagram studies of emerging lead-freesolder candidates.

Neutron diffraction study of stability and phase transitions in Cu-Sn-In alloys as alternative Pb-free solders